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    Subject[patch 33/53] ACPI: disable ACPI cleanly when bad RSDP found
    2.6.28-stable review patch.  If anyone has any objections, please let us know.
    ------------------

    From: Len Brown <len.brown@intel.com>

    commit 9e3a9d1ed8cc8db93e5c53e9a5b09065bd95de8b upstream.

    When ACPI is disabled in the BIOS of this VIA C3 box,
    it invalidates the RSDP, which Linux notices:

    ACPI Error (tbxfroot-0218): A valid RSDP was not found [20080926]

    Bug Linux neglected to disable ACPI at that stage,
    and later scribbled on smp_found_config:

    ACPI: No APIC-table, disabling MPS

    But this box doesn't run well in legacy PIC mode,
    it needed IOAPIC mode to perform correctly:

    http://lkml.org/lkml/2009/2/5/39

    So exit ACPI mode cleanly when we first detect
    that it is hopeless.

    Signed-off-by: Len Brown <len.brown@intel.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

    ---
    drivers/acpi/tables.c | 7 ++++++-
    1 file changed, 6 insertions(+), 1 deletion(-)

    --- a/drivers/acpi/tables.c
    +++ b/drivers/acpi/tables.c
    @@ -293,7 +293,12 @@ static void __init check_multiple_madt(v

    int __init acpi_table_init(void)
    {
    - acpi_initialize_tables(initial_tables, ACPI_MAX_TABLES, 0);
    + acpi_status status;
    +
    + status = acpi_initialize_tables(initial_tables, ACPI_MAX_TABLES, 0);
    + if (ACPI_FAILURE(status))
    + return 1;
    +
    check_multiple_madt();
    return 0;
    }


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